Impact Soil Tester

Medium Clegg Hammer

The 2.25 kg "Medium" CleggHammer was initially based on the "standard proctor" 2.5 kg laboratory compaction hammer but evolved to its present weight and drop-height for measuring shock attenuation characteristics of natural and artificial playing surfaces. It is constructed to be the same size as the Standard Clegg Hammer by using a mechanical combination of aluminum and hardened steel for the striking end rather than steel with a hardened steel end as used for the Standard Clegg Hammer. The shipping weight with the Australian case is a around 11 kg. Notation for the output at the fourth drop is CIV/M for "Medium Clegg Impact Value" when the Medium Clegg Hammer is dropped from its standard height of 45 cm, where the output is in Clegg units, i.e. where 1 Clegg unit equals 10 gravity units with the resulting decimal fraction truncated. Shown above left is a red-painted aluminium drop-hammer (e.g. Model 883) and shown above right is a red anodised drop-hammer (e.g. Model GTM-SS-E), both with hardened steel ends.

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